Does Motorola make an ASTRO modem that is a stand alone sort of device so that one can interface analog tone desk set(s) to a remote Quantar? As previously discussed on this board, we know that an ASTRO modem can be configured in the Quantar repeater, and in a DIU 3000. But, this arrangement makes sense when there are encryption needs. However, if there is no need for encryption, does Motorola have a stand alone ASTRO modem that one could interface to a tone remote? Does the DGT-9000 desk set have a built-in ASTRO modem? Can a DGT-9000 be outfitted with DES-OFB?
Thanks!
Larry
ASTRO Modem
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ASTROMODAT
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This whole Astro infrastructure business is very confusing - which is why we (an associate & I) decided to set up some pieces & play.
We are assuming a typical system comprised of field units (mobiles & portables), a repeater, and one or more control points (fixed locations - office, comm center, EOC, etc.)
The first system configuration possiblilty is to operate a Quantar repeater and access it remotely from the control point using a control station. This would be an Astro Spectra Consolette. This is the scenario that supports the use of the DGT9000 (or maybe they call it an RCH3000 this week). If secure is to be part of this scenario the encryption would go in the Astro Spectra - not the DGT.
The second possible configuration would be to use another Quantar as a control station whereas the third possibility would be to directly control the repeater by wireline from the remote / console.
The first thing we need to clarify is that to control a digital capable Quantar you have to have a DIU. This is true regardless of whether you are talking VSELP or IMBE and whether you are using secure or not and whether you are digital only or mixed mode, and also whether the Quantar and the console are remote or co-located. First basic point - want digital - have DIU.
If the DIU and the Quantar are co-located (defined as within 50 feet of wire) you use a V.24 connection and a four-wire audio connection between them. The four wire connection passes analog voice back and forth between the DIU and the Quantar. The V.24 link passes the digitized Astro voice between the DIU and the Quantar. The V.24 link also passes the control commands between the DIU and the Quantar. This includes PTT, unsquelch, etc. This is true regardless of the type of traffic and regardless of the type of console connected on the other side of the DIU.
Beyond the 50 feet you have to use modems. These can be the Motorola Astro modems which reside within the equipment or external V.32 9600 bps modems can be used instead. If the internal modems are used they share the same four-wire circuit (leased line or microwave channel) between the Quantar and the DIU that is used for the analog voice audio. Second basic point - up to 50 feet use V.24 link, over 50 feet modems are required - (regardless of whether or not secure is involved)
If external modems are going to be used the DIU and the Quantar have to be equipped with the V.24 ports (similar to RS-232) which then connect to the modems. Then the modems connect to each other over ANOTHER four wire circuit. Third basic point - internal modems = one 4-wire circuit, external modems = two 4-wire circuits. The only exception here would be for a digital only (not mixed mode - no analog voice at all) system there would only be one circuit required regardless of whether the modems are internal or external.
Last issue - the DIU supports console interface to tone remote devices, to E&M devices, and to the Centracom Series II Gold Elite with an ACIM. There is nothing in any of the supplied documentation that suggests the DIU can be connected to a DGT9000 or RCH3000 (but who knows for sure - with Motorola anything is possible).
All clear now? We still are not 100% but we are closer!
We are assuming a typical system comprised of field units (mobiles & portables), a repeater, and one or more control points (fixed locations - office, comm center, EOC, etc.)
The first system configuration possiblilty is to operate a Quantar repeater and access it remotely from the control point using a control station. This would be an Astro Spectra Consolette. This is the scenario that supports the use of the DGT9000 (or maybe they call it an RCH3000 this week). If secure is to be part of this scenario the encryption would go in the Astro Spectra - not the DGT.
The second possible configuration would be to use another Quantar as a control station whereas the third possibility would be to directly control the repeater by wireline from the remote / console.
The first thing we need to clarify is that to control a digital capable Quantar you have to have a DIU. This is true regardless of whether you are talking VSELP or IMBE and whether you are using secure or not and whether you are digital only or mixed mode, and also whether the Quantar and the console are remote or co-located. First basic point - want digital - have DIU.
If the DIU and the Quantar are co-located (defined as within 50 feet of wire) you use a V.24 connection and a four-wire audio connection between them. The four wire connection passes analog voice back and forth between the DIU and the Quantar. The V.24 link passes the digitized Astro voice between the DIU and the Quantar. The V.24 link also passes the control commands between the DIU and the Quantar. This includes PTT, unsquelch, etc. This is true regardless of the type of traffic and regardless of the type of console connected on the other side of the DIU.
Beyond the 50 feet you have to use modems. These can be the Motorola Astro modems which reside within the equipment or external V.32 9600 bps modems can be used instead. If the internal modems are used they share the same four-wire circuit (leased line or microwave channel) between the Quantar and the DIU that is used for the analog voice audio. Second basic point - up to 50 feet use V.24 link, over 50 feet modems are required - (regardless of whether or not secure is involved)
If external modems are going to be used the DIU and the Quantar have to be equipped with the V.24 ports (similar to RS-232) which then connect to the modems. Then the modems connect to each other over ANOTHER four wire circuit. Third basic point - internal modems = one 4-wire circuit, external modems = two 4-wire circuits. The only exception here would be for a digital only (not mixed mode - no analog voice at all) system there would only be one circuit required regardless of whether the modems are internal or external.
Last issue - the DIU supports console interface to tone remote devices, to E&M devices, and to the Centracom Series II Gold Elite with an ACIM. There is nothing in any of the supplied documentation that suggests the DIU can be connected to a DGT9000 or RCH3000 (but who knows for sure - with Motorola anything is possible).
All clear now? We still are not 100% but we are closer!
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ASTROMODAT
- Posts: 1825
- Joined: Tue Nov 05, 2002 12:32 am
I am saving your excellent explanation, xmo! I'm all clear now.
If I understand you correctly, then springing for the 1) DIU 3000 and 2) an internal ASTRO modem at the Quantar and at the DIU 3000 makes the most sense. And, it appears that this arrangement will support: 1) clear analog 2) clear ASTRO digital and 3) DES-OFB ASTRO digital (with the encryption "cartridge") and I will need a single 3002, 4-wire private line circuit?
One question I do have: I assume there is no need for me to order the MRTI interface option on the Quantar, nor the V.24 connection, so long as I have the modem at both ends and in the DIU?
Do I have it correct?
Larry
If I understand you correctly, then springing for the 1) DIU 3000 and 2) an internal ASTRO modem at the Quantar and at the DIU 3000 makes the most sense. And, it appears that this arrangement will support: 1) clear analog 2) clear ASTRO digital and 3) DES-OFB ASTRO digital (with the encryption "cartridge") and I will need a single 3002, 4-wire private line circuit?
One question I do have: I assume there is no need for me to order the MRTI interface option on the Quantar, nor the V.24 connection, so long as I have the modem at both ends and in the DIU?
Do I have it correct?
Larry
"...springing for the 1) DIU 3000 and 2) an internal ASTRO modem at the Quantar and at the DIU 3000 makes the most sense. And, it appears that this arrangement will support: 1) clear analog 2) clear ASTRO digital and 3) DES-OFB ASTRO digital (with the encryption "cartridge") and I will need a single 3002, 4-wire private line circuit? ..."
You've got it!
You won't need the phone patch option at the Quantar end but you will need the C54BF Phone Patch option on the DIU3000.
You've got it!
You won't need the phone patch option at the Quantar end but you will need the C54BF Phone Patch option on the DIU3000.